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                        <h2 id="if&#x5D4C;&#x5957;">if&#x5D4C;&#x5957;</h2>
<p>&#x901A;&#x8FC7;&#x5B66;&#x4E60;if&#x7684;&#x57FA;&#x672C;&#x7528;&#x6CD5;&#xFF0C;&#x5DF2;&#x7ECF;&#x77E5;&#x9053;&#x4E86;</p>
<ul>
<li>&#x5F53;&#x9700;&#x8981;&#x6EE1;&#x8DB3;&#x6761;&#x4EF6;&#x53BB;&#x505A;&#x4E8B;&#x60C5;&#x7684;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x9700;&#x8981;&#x4F7F;&#x7528;if</li>
<li>&#x5F53;&#x6EE1;&#x8DB3;&#x6761;&#x4EF6;&#x65F6;&#x505A;&#x4E8B;&#x60C5;A&#xFF0C;&#x4E0D;&#x6EE1;&#x8DB3;&#x6761;&#x4EF6;&#x505A;&#x4E8B;&#x60C5;B&#x7684;&#x8FD9;&#x79CD;&#x60C5;&#x51B5;&#x4F7F;&#x7528;if-else</li>
</ul>
<p>&#x60F3;&#x4E00;&#x60F3;&#xFF1A;</p>
<blockquote>
<p>&#x5750;&#x706B;&#x8F66;&#x6216;&#x8005;&#x5730;&#x94C1;&#x7684;&#x5B9E;&#x9645;&#x60C5;&#x51B5;&#x662F;&#xFF1A;&#x5148;&#x8FDB;&#x884C;&#x5B89;&#x68C0;&#x5982;&#x679C;&#x5B89;&#x68C0;&#x901A;&#x8FC7;&#x624D;&#x4F1A;&#x5224;&#x65AD;&#x662F;&#x5426;&#x6709;&#x8F66;&#x7968;&#xFF0C;&#x6216;&#x8005;&#x662F;&#x5148;&#x68C0;&#x67E5;&#x662F;&#x5426;&#x6709;&#x8F66;&#x7968;&#x4E4B;&#x540E;&#x624D;&#x4F1A;&#x8FDB;&#x884C;&#x5B89;&#x68C0;&#xFF0C;&#x5373;&#x5B9E;&#x9645;&#x7684;&#x60C5;&#x51B5;&#x67D0;&#x4E2A;&#x5224;&#x65AD;&#x662F;&#x518D;&#x53E6;&#x5916;&#x4E00;&#x4E2A;&#x5224;&#x65AD;&#x6210;&#x7ACB;&#x7684;&#x57FA;&#x7840;&#x4E0A;&#x8FDB;&#x884C;&#x7684;&#xFF0C;&#x8FD9;&#x6837;&#x7684;&#x60C5;&#x51B5;&#x8BE5;&#x600E;&#x6837;&#x89E3;&#x51B3;&#x5462;&#xFF1F;</p>
</blockquote>
<p>&#x7B54;&#xFF1A;</p>
<blockquote>
<p>if&#x5D4C;&#x5957;</p>
</blockquote>
<h3 id="&#x4E00;&#x3001;if&#x5D4C;&#x5957;&#x7684;&#x683C;&#x5F0F;">&#x4E00;&#x3001;if&#x5D4C;&#x5957;&#x7684;&#x683C;&#x5F0F;</h3>
<pre><code class="lang-python">    <span class="hljs-keyword">if</span> &#x6761;&#x4EF6;<span class="hljs-number">1</span>:

        &#x6EE1;&#x8DB3;&#x6761;&#x4EF6;<span class="hljs-number">1</span> &#x505A;&#x7684;&#x4E8B;&#x60C5;<span class="hljs-number">1</span>
        &#x6EE1;&#x8DB3;&#x6761;&#x4EF6;<span class="hljs-number">1</span> &#x505A;&#x7684;&#x4E8B;&#x60C5;<span class="hljs-number">2</span>

        <span class="hljs-keyword">if</span> &#x6761;&#x4EF6;<span class="hljs-number">2</span>:
            &#x6EE1;&#x8DB3;&#x6761;&#x4EF6;<span class="hljs-number">2</span> &#x505A;&#x7684;&#x4E8B;&#x60C5;<span class="hljs-number">1</span>
            &#x6EE1;&#x8DB3;&#x6761;&#x4EF6;<span class="hljs-number">2</span> &#x505A;&#x7684;&#x4E8B;&#x60C5;<span class="hljs-number">2</span>
</code></pre>
<ul>
<li>&#x8BF4;&#x660E;<ul>
<li>&#x5916;&#x5C42;&#x7684;if&#x5224;&#x65AD;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;if-else</li>
<li>&#x5185;&#x5C42;&#x7684;if&#x5224;&#x65AD;&#xFF0C;&#x4E5F;&#x53EF;&#x4EE5;&#x662F;if-else</li>
<li>&#x6839;&#x636E;&#x5B9E;&#x9645;&#x5F00;&#x53D1;&#x7684;&#x60C5;&#x51B5;&#xFF0C;&#x8FDB;&#x884C;&#x9009;&#x62E9;</li>
</ul>
</li>
</ul>
<h3 id="&#x4E8C;&#x3001;if&#x5D4C;&#x5957;&#x7684;&#x5E94;&#x7528;">&#x4E8C;&#x3001;if&#x5D4C;&#x5957;&#x7684;&#x5E94;&#x7528;</h3>
<p>demo&#xFF1A;</p>
<pre><code class="lang-python">ticket = <span class="hljs-number">1</span>     <span class="hljs-comment"># &#x7528;1&#x4EE3;&#x8868;&#x6709;&#x8F66;&#x7968;&#xFF0C;0&#x4EE3;&#x8868;&#x6CA1;&#x6709;&#x8F66;&#x7968;</span>
knife_length = <span class="hljs-number">9</span>     <span class="hljs-comment"># &#x5200;&#x5B50;&#x7684;&#x957F;&#x5EA6;&#xFF0C;&#x5355;&#x4F4D;&#x4E3A;cm</span>

<span class="hljs-keyword">if</span> ticket == <span class="hljs-number">1</span>:
    print(<span class="hljs-string">&quot;&#x6709;&#x8F66;&#x7968;&#xFF0C;&#x53EF;&#x4EE5;&#x8FDB;&#x7AD9;&quot;</span>)
    <span class="hljs-keyword">if</span> knife_length &lt; <span class="hljs-number">10</span>:
        print(<span class="hljs-string">&quot;&#x901A;&#x8FC7;&#x5B89;&#x68C0;&quot;</span>)
        print(<span class="hljs-string">&quot;&#x7EC8;&#x4E8E;&#x53EF;&#x4EE5;&#x89C1;&#x5230;Ta&#x4E86;&#xFF0C;&#x7F8E;&#x6ECB;&#x6ECB;~~~&quot;</span>)
    <span class="hljs-keyword">else</span>:
        print(<span class="hljs-string">&quot;&#x6CA1;&#x6709;&#x901A;&#x8FC7;&#x5B89;&#x68C0;&quot;</span>)
        print(<span class="hljs-string">&quot;&#x5200;&#x5B50;&#x7684;&#x957F;&#x5EA6;&#x8D85;&#x8FC7;&#x89C4;&#x5B9A;&#xFF0C;&#x7B49;&#x5F85;&#x8B66;&#x5BDF;&#x5904;&#x7406;...&quot;</span>)
<span class="hljs-keyword">else</span>:
    print(<span class="hljs-string">&quot;&#x6CA1;&#x6709;&#x8F66;&#x7968;&#xFF0C;&#x4E0D;&#x80FD;&#x8FDB;&#x7AD9;&quot;</span>)
    print(<span class="hljs-string">&quot;&#x4EB2;&#x7231;&#x7684;&#xFF0C;&#x90A3;&#x5C31;&#x4E0B;&#x6B21;&#x89C1;&#x4E86;&quot;</span>)
</code></pre>
<p>&#x7ED3;&#x679C;1&#xFF1A;ticket = 1;knife_length = 9</p>
<pre><code>    &#x6709;&#x8F66;&#x7968;&#xFF0C;&#x53EF;&#x4EE5;&#x8FDB;&#x7AD9;
    &#x901A;&#x8FC7;&#x5B89;&#x68C0;
    &#x7EC8;&#x4E8E;&#x53EF;&#x4EE5;&#x89C1;&#x5230;Ta&#x4E86;&#xFF0C;&#x7F8E;&#x6ECB;&#x6ECB;~~~
</code></pre><p>&#x7ED3;&#x679C;2&#xFF1A;ticket = 1;knife_length = 20</p>
<pre><code class="lang-c">    &#x6709;&#x8F66;&#x7968;&#xFF0C;&#x53EF;&#x4EE5;&#x8FDB;&#x7AD9;
    &#x6CA1;&#x6709;&#x901A;&#x8FC7;&#x5B89;&#x68C0;
    &#x5200;&#x5B50;&#x7684;&#x957F;&#x5EA6;&#x8D85;&#x8FC7;&#x89C4;&#x5B9A;&#xFF0C;&#x7B49;&#x5F85;&#x8B66;&#x5BDF;&#x5904;&#x7406;...
</code></pre>
<p>&#x7ED3;&#x679C;3&#xFF1A;ticket = 0;knife_length = 9</p>
<pre><code>    &#x6CA1;&#x6709;&#x8F66;&#x7968;&#xFF0C;&#x4E0D;&#x80FD;&#x8FDB;&#x7AD9;
    &#x4EB2;&#x7231;&#x7684;&#xFF0C;&#x90A3;&#x5C31;&#x4E0B;&#x6B21;&#x89C1;&#x4E86;
</code></pre><p>&#x7ED3;&#x679C;4&#xFF1A;ticket = 0;knife_length = 20</p>
<pre><code>    &#x6CA1;&#x6709;&#x8F66;&#x7968;&#xFF0C;&#x4E0D;&#x80FD;&#x8FDB;&#x7AD9;
    &#x4EB2;&#x7231;&#x7684;&#xFF0C;&#x90A3;&#x5C31;&#x4E0B;&#x6B21;&#x89C1;&#x4E86;
</code></pre><ul>
<li>&#x60F3;&#x4E00;&#x60F3;:&#x4E3A;&#x4EC0;&#x4E48;&#x7ED3;&#x679C;3&#x548C;&#x7ED3;&#x679C;4&#x76F8;&#x540C;&#xFF1F;&#xFF1F;&#xFF1F;</li>
</ul>
<h3 id="&#x4E09;&#x3001;&#x7EC3;&#x4E00;&#x7EC3;">&#x4E09;&#x3001;&#x7EC3;&#x4E00;&#x7EC3;</h3>
<p>&#x60C5;&#x8282;&#x63CF;&#x8FF0;&#xFF1A;&#x4E0A;&#x516C;&#x4EA4;&#x8F66;&#xFF0C;&#x5E76;&#x4E14;&#x53EF;&#x4EE5;&#x6709;&#x5EA7;&#x4F4D;&#x5750;&#x4E0B;</p>
<p>&#x8981;&#x6C42;&#xFF1A;&#x8F93;&#x5165;&#x516C;&#x4EA4;&#x5361;&#x5F53;&#x524D;&#x7684;&#x4F59;&#x989D;&#xFF0C;&#x53EA;&#x8981;&#x8D85;&#x8FC7;2&#x5143;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x4E0A;&#x516C;&#x4EA4;&#x8F66;&#xFF1B;&#x5982;&#x679C;&#x8F66;&#x4E0A;&#x6709;&#x7A7A;&#x5EA7;&#x4F4D;&#xFF0C;&#x5C31;&#x53EF;&#x4EE5;&#x5750;&#x4E0B;&#x3002;</p>

                    
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